The "old" jeep in the picture is a Willys CJ-3B, produced in the US for civilian use from 1953 through 1968. There were some military versions produced, both in the US and by foreign manufacturers under license from Willys. The one pictured above has civilian cues.
(Note that an "MB" was a WWII version, and did not have the high hood (seen above on the CJ3B) required for the later F-head, overhead valve engine.)
Technicalities aside, that is a really cool pic! I especially love the '71 Renegade... I owned a '71 (non-renegade) for 16 years...
That 3B looks like a great trail rig!